1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    *
5    *
6    *
7    * The contents of this file are subject to the terms of the Liferay Enterprise
8    * Subscription License ("License"). You may not use this file except in
9    * compliance with the License. You can obtain a copy of the License by
10   * contacting Liferay, Inc. See the License for the specific language governing
11   * permissions and limitations under the License, including but not limited to
12   * distribution rights of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.util;
24  
25  import java.util.ArrayList;
26  import java.util.Collection;
27  import java.util.Iterator;
28  
29  /**
30   * <a href="UniqueList.java.html"><b><i>View Source</i></b></a>
31   *
32   * @author Brian Wing Shun Chan
33   */
34  public class UniqueList<E> extends ArrayList<E> {
35  
36      public UniqueList() {
37          super();
38      }
39  
40      public boolean add(E e) {
41          if (!contains(e)) {
42              return super.add(e);
43          }
44          else {
45              return false;
46          }
47      }
48  
49      public void add(int index, E e) {
50          if (!contains(e)) {
51              super.add(index, e);
52          }
53      }
54  
55      public boolean addAll(Collection<? extends E> c) {
56          c = new ArrayList<E>(c);
57  
58          Iterator<? extends E> itr = c.iterator();
59  
60          while (itr.hasNext()) {
61              E e = itr.next();
62  
63              if (contains(e)) {
64                  itr.remove();
65              }
66          }
67  
68          return super.addAll(c);
69      }
70  
71      public boolean addAll(int index, Collection<? extends E> c) {
72          c = new ArrayList<E>(c);
73  
74          Iterator<? extends E> itr = c.iterator();
75  
76          while (itr.hasNext()) {
77              E e = itr.next();
78  
79              if (contains(e)) {
80                  itr.remove();
81              }
82          }
83  
84          return super.addAll(index, c);
85      }
86  
87      public E set(int index, E e) {
88          if (!contains(e)) {
89              return super.set(index, e);
90          }
91          else {
92              return e;
93          }
94      }
95  
96  }